Stop-valve construction.



; PATENTED MAY 7, 1907.

A. W. FISCHER & P. W. KNAUR STOP VALVE CONSTRUCTION.

APPLICATION FILED AUG. 4, 1905.

m r L W i M E M 5 J Q 2 INVENTORS.

' A TTOHHEY.

ADJUJBERT W. FISCHER AND PAUL 'W. KNAUF, OF PHIL- DELI-KIA, PENN-SYLVANIA, ASSQIGNORS TO SQHUTTE AND KOERTING COMPANY, OF PHILADELPHIA,PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

STGP VALVE GQi'dSsTRUGTlONa Specification of Letters Patent.

Patented 7, 1907.

To will whom it may eon/007%:

Be it known that We, ADALBERT W.

F isoHER, a subject of the Emperor of Germany, and PAUL W. KNAUF, acitizen of the Uniteil S'iICtLS of America, both residing in the cityand county of Philadelphia, in the State of Pennsylvania, have inventeda certain new and useful improvement in Stop Valve Construction, ofwhich the following is atrnc and exact description, referencebeing hadto the accompanying drawings, which form it part thereof.

Our invention relates to stop v lves such as are used in the conduitsleading from is steam boilers to engines where the steam is utilized,said valves being adapted to open freely uni'lei' the normal liow ofsteam and to close automatically in case ior any reason the pressure onthe boiler side oi the valve falls below that on the engine side.

The object of our invention is to provide such valves with improvedmechanism for Pi'OiIlIfiljf closing against the pressure 0' the steam orother pressure iluii'i passing through them even iv ien the flow is normill or excess invention. consists in nroviiiii'ig eoylinrier .ml piston,the o' vlin lei' being conuectcrl with boiler or other soui'ie oipressure and the piston arranged Whc-n o lilOVill lllliiul' the pressure'il to act on. 'vzilvi-r in t e (ll *otion of L and in addition to thisimon W", pro'inl supplen'ieirtal m0 acting-ig oothcpist i "through noviivi: to olose it, said means lie/int; hehl out oi operation by areleaswe we use in addition to the '45 i'une ion it is to close the four in ,n'ovcview of the I huziil by pressun, to close the valve is A,indicates the valve chamber having inlet chamber A, and outlet chamber AB, is ec-ap or head for the casing forme as shown With upright arms B,B, which support a guidewsy B.

B", is a pivot attached to the lower end of the head, B", a pivotattache to the upper end of the guideway.

C, is the valve seat, D, the stop valve, h eving, as shown, a stemconnecting it with the piston D moving in the lower end of cylinder E,the head of which formed by the cap E.

i is e conduit forfluid under pressure-011$ ing to the upper end of thecylinder E l'iTOIl'l the same source of pressure as that n hich suppliesthe chamber A".

G, is a pistonworlting in the upperend of the cylinder i end having astem 6, 0:;- tencling through stulliiv to); in the cap B.

As shown, ll, is a sliding head moving in the guide way and kept fromrotating as shown. by a. feather HQ l, is a screw spindle Working on aninternally threaded pant N of the head ii, the lo er and of the spindleresting! normally in contact with the spindle U, and the upper endhaving attached to it hiiiuln hoel l.

J, J, are links secin'ei'l to the pivot 3*, anti to the piv ll, in theends ol the cloulzle armed lovers 3", which l en; :1 i pivoted to theheznl ii, by it pivot pin ll, thiil hes secured upon their outer will a(:ountvmei J. The lever J, is pi rotslly iiiiechwfl join r.i lli(l1(llllf out l'rom 2L sliding l!L2i(lin moving on 21 1 M so i v pivot Din i5,and i'ormm {L A head ii", firmly securea'l to t Upper J-ml ol' the iUClK. :aili ipi' s a pivot ii. ii on which is pive the i201 iCYii ii, 1having it lillls'iil jaw ll, adap ed to e'nggaeii with the hitch jaw sias she ..i-

N, l-52L-11()l(l attached to the sri'n L. of the hitch lover, F hwhiel'i it (mi hr- 1'! role: l i This nor-(l mm. lre

s0 mo hon, it-ed l'ijv' any convenient inuchzn'ih'zil connecti either:nitoiimtio oi otherwise.

or normal conditions, and when 171 (a i. open, the pressure in thevhzm'ihei ei's hut little l'ion'i the boiler pressure, nilin its nobetween the piston i), and the well. oi the cylinder E11, maintains a,

substantially equal pressure in the lower part of the said cylinder andon the lower side of the piston G, which, therefore, by reason of thedillermicc in area of its two faces normolly -lcupies its uppermostposition as shon n in Fig. i. 'lhe boiler pressure on its upper face notbeing sullicient to coui'iteract the slightly less than boiler pressureon its lower and larger face the function of the lower ']')iston Ddirectly attaol'xed to the valve is the familiar function of suchpistons, namely, that of preventing sudden movements of the valve due tofluctuations of pressure in the conduit of a disregardahle nature. Thehead 11, H", together with the screw spindle l, are normally held intheir uppermost position, as shown in Fig. 1, by the engagement of thehead M, supporting the counterweight lever With the latch lever L, L butllnfllmlh on the release of the latch the counterweight forces down thehead H, H and the screw spindle which presses on the end of the pistonspindle G, supplements the boiler pressure on the top of the pistonforcing it down into contact with the piston D, and

forcing said piston and the valve attached thereto to its seat where itwill he held until the cminterweight lever is again raised.

' The screw spindle l, is of course adjustable in the head by means ofthe hand wheel. l, and can he used. to lock the valve closed in theusual Way, and can also be used to raise the sliding head andcounterweight lever to normal position. after the release of said leverfrom the latch.

Having now described. our invention, What We claim as new and desire tosecure by Let ters Patent is 1. A stop valve for controlling the llow offluid under pressure through a conduit, in combination with a cylinderconnected to the same source of-fiuid pressure as that supplying theconduit, a piston in said cylinder an ranged when moved under theinfluence of the pressure fluid to act on the stop valve in a directionto close it, means for applying additional pressure to the piston, andthrough-it, to the valve, and a releasable latch normally holding: saidmeans out of operation.

2'. A stop valve for controlling the flow of .lluidunder pressurethrough a conduit, in combination with a cylinder connected to the samesource of fluid pressure as that supplying the comluit, arranged in linewith "the valve, a piston directly connected to the valve and working inthe cylinder, a second piston working in the cylinder above the firstand directlyexposed to the action of the pressure 1 iluid means i orapplying additional pressure to the upper piston and through it to thevalve, and a releasable latch normally holding said means out ofoperation.

A stop valve for controlling the flow of fluid under pressure through aconduit, in combination with. a cylinder connected to the same source offluid pressure as that supplying the conduit, arranged in line with thevalve, a piston directly connected to the valve and working; in thecylinder, a second piston working in the cylinder above the first anddirectly exposed to the action of the pressure fluid, a stem connectedto said second piston and extending through the head ol the cylinder, athreaded head slidably supported in line with the piston stem, a rodscrewing in said head and normally resting on the end oi the pistonstem, means tending to depress the head and screw rod and a releasablelatch normally holding; the head in elevated positioin l DALBERT W.FISCHER. PAUL lV. KNAUF.

Witnesses 1 Anson) liners,

l). Fi'rnwmrr.

